/* ==========================================================================
   School Web Design - Custom Stylesheet
   Theme Color: Green (Primary), Yellow/Gold (Secondary), White (Base)
   Fonts: Kanit (Headings), Prompt (Body)
   ========================================================================== */

/* 1. Import Fonts */
@import url('https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600;700&family=Prompt:wght@200;300;400;500;600&display=swap');

/* 2. Color System & Theme Variables */
:root {
    /* Fonts */
    --font-heading: 'Kanit', sans-serif;
    --font-body: 'Prompt', sans-serif;

    /* Light Theme Colors */
    --primary-color: #166534;        /* School Green */
    --primary-color-rgb: 22, 101, 52;
    --secondary-color: #eab308;      /* School Gold/Yellow */
    --secondary-color-rgb: 234, 179, 8;
    
    --bg-base: #f8fafc;              /* Slate 50 */
    --bg-surface: #ffffff;
    --bg-surface-rgb: 255, 255, 255;
    
    --text-primary: #1e293b;         /* Slate 800 */
    --text-secondary: #64748b;       /* Slate 500 */
    --border-color: #e2e8f0;         /* Slate 200 */
    
    /* Premium Styling Effects */
    --shadow-soft: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 20px 40px -15px rgba(22, 101, 52, 0.15);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.4);
    
    --border-radius-lg: 1.25rem;
    --border-radius-md: 0.75rem;
    
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    /* Dark Theme Colors */
    --bg-base: #0f172a;              /* Slate 900 */
    --bg-surface: #1e293b;           /* Slate 800 */
    --bg-surface-rgb: 30, 41, 59;
    
    --text-primary: #f8fafc;         /* Slate 50 */
    --text-secondary: #94a3b8;       /* Slate 400 */
    --border-color: #334155;         /* Slate 700 */
    
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow-soft: 0 10px 30px -10px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
}

/* 3. Base Styles */
body {
    font-family: var(--font-body);
    background-color: var(--bg-base);
    color: var(--text-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

h1, h2, h3, h4, h5, h6, .font-heading {
    font-family: var(--font-heading);
    font-weight: 600;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-base);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* 4. Glassmorphism Utilities */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-soft);
    border-radius: var(--border-radius-lg);
    transition: transform var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow var(--transition-speed) ease,
                border-color var(--transition-speed) ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(var(--primary-color-rgb), 0.3);
}

.glass-navbar {
    background: rgba(var(--bg-surface-rgb), 0.8) !important;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    transition: background var(--transition-speed) ease;
}

/* 5. Custom Button Styles */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #ffffff;
    font-family: var(--font-heading);
    font-weight: 500;
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    box-shadow: 0 4px 14px 0 rgba(var(--primary-color-rgb), 0.2);
    transition: all var(--transition-speed) ease;
}

.btn-primary:hover {
    background-color: #15803d; /* Darker green */
    border-color: #15803d;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(var(--primary-color-rgb), 0.3);
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: #1e293b;
    font-family: var(--font-heading);
    font-weight: 500;
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
    box-shadow: 0 4px 14px 0 rgba(var(--secondary-color-rgb), 0.2);
    transition: all var(--transition-speed) ease;
}

.btn-secondary:hover {
    background-color: #ca8a04; /* Darker gold */
    border-color: #ca8a04;
    color: #1e293b;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(var(--secondary-color-rgb), 0.3);
}

/* 6. Page Loader Screen */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-base);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 99999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.spinner-custom {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(var(--primary-color-rgb), 0.1);
    border-top: 5px solid var(--primary-color);
    border-right: 5px solid var(--secondary-color);
    border-radius: 50%;
    animation: spin-anim 1s linear infinite;
}

@keyframes spin-anim {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 7. Homepage Layout Customization */

/* Hero Banner Slideshow */
.hero-slider .carousel-item {
    height: 65vh;
    min-height: 400px;
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    position: relative;
}

.hero-slider .carousel-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(22, 101, 52, 0.4) 0%, rgba(15, 23, 42, 0.8) 100%);
}

.carousel-caption {
    bottom: 25%;
    z-index: 2;
}

/* Quick Links Card List */
.quick-link-card {
    border-radius: var(--border-radius-md);
    background: linear-gradient(135deg, rgba(var(--primary-color-rgb), 0.05) 0%, rgba(var(--secondary-color-rgb), 0.05) 100%);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    transition: all var(--transition-speed) ease;
}

.quick-link-card:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, #15803d 100%);
    color: #ffffff !important;
    transform: scale(1.03);
    box-shadow: var(--shadow-hover);
}

.quick-link-card:hover i {
    color: var(--secondary-color) !important;
}

/* Counter Statistics Grid */
.counter-box {
    text-align: center;
    padding: 2rem 1rem;
}

.counter-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    font-family: var(--font-heading);
}

[data-theme="dark"] .counter-value {
    color: var(--secondary-color);
}

/* Card images lazy-loading effects */
.lazy-image {
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.lazy-image.loaded {
    opacity: 1;
}

/* 8. AI Chatbot Widget (Floating interface UI) */
.chatbot-widget {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 1000;
    font-family: var(--font-body);
}

.chatbot-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, #15803d 100%);
    border: none;
    box-shadow: 0 8px 24px rgba(22, 101, 52, 0.3);
    color: #ffffff;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.chatbot-btn:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 30px rgba(22, 101, 52, 0.4);
}

.chatbot-window {
    width: 380px;
    height: 500px;
    position: absolute;
    bottom: 80px;
    right: 0;
    display: none;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
    border-radius: var(--border-radius-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform: translateY(20px);
    opacity: 0;
}

.chatbot-window.active {
    display: flex;
    transform: translateY(0);
    opacity: 1;
}

.chatbot-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #15803d 100%);
    color: #ffffff;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chatbot-body {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    background: var(--bg-base);
}

.chatbot-message {
    margin-bottom: 0.75rem;
    max-width: 80%;
    padding: 0.75rem;
    border-radius: var(--border-radius-md);
    font-size: 0.9rem;
    line-height: 1.4;
}

.message-ai {
    background: var(--bg-surface);
    color: var(--text-primary);
    align-self: flex-start;
    border-bottom-left-radius: 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
    border: 1px solid var(--border-color);
}

.message-user {
    background: var(--primary-color);
    color: #ffffff;
    align-self: flex-end;
    border-bottom-right-radius: 0;
    margin-left: auto;
}

.chatbot-footer {
    padding: 0.75rem;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

/* 9. Premium Admin Dashboard Styles */
.admin-sidebar {
    background-color: var(--primary-color);
    color: rgba(255, 255, 255, 0.8);
    min-height: 100vh;
    box-shadow: 4px 0 10px rgba(0, 0, 0, 0.05);
}

.admin-sidebar .nav-link {
    color: rgba(255, 255, 255, 0.85);
    padding: 0.8rem 1.5rem;
    font-family: var(--font-heading);
    border-radius: 0.5rem;
    margin: 0.2rem 1rem;
    transition: all 0.2s ease;
}

.admin-sidebar .nav-link:hover,
.admin-sidebar .nav-link.active {
    background-color: rgba(255, 255, 255, 0.15);
    color: var(--secondary-color) !important;
}

.metric-card {
    border: none;
    border-left: 5px solid var(--primary-color);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-surface);
    box-shadow: var(--shadow-soft);
    transition: all var(--transition-speed) ease;
}

.metric-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.metric-card.gold-border {
    border-left-color: var(--secondary-color);
}

/* 10. News detail pages formatting */
.news-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-md);
    margin: 1.5rem 0;
}

.ai-summary-card {
    background: linear-gradient(135deg, rgba(22, 101, 52, 0.05) 0%, rgba(234, 179, 8, 0.05) 100%);
    border: 1px dashed var(--primary-color);
    border-radius: var(--border-radius-md);
    padding: 1.25rem;
}

/* Responsive Overrides */
@media (max-width: 768px) {
    .chatbot-window {
        width: calc(100vw - 40px);
        right: -10px;
    }
    .carousel-caption h1 {
        font-size: 1.8rem;
    }
    .carousel-caption p {
        font-size: 1rem;
    }
}

/* Navbar Dropdown styling (Including Dark Mode support) */
.navbar-nav .dropdown-menu {
    border-radius: var(--border-radius-md);
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    margin-top: 10px;
}

.dropdown-item {
    color: var(--text-primary);
    padding: 0.5rem 1.25rem;
    transition: all var(--transition-speed) ease;
}

/* Header Navbar Links Hover Customization */
.glass-navbar .navbar-nav .nav-link {
    transition: color var(--transition-speed) ease;
}

.glass-navbar .navbar-nav .nav-link:hover,
.glass-navbar .navbar-nav .nav-link:focus,
.glass-navbar .navbar-nav .nav-link.show {
    color: var(--secondary-color) !important;
}

.dropdown-item:hover {
    background-color: rgba(var(--secondary-color-rgb), 0.1);
    color: var(--secondary-color) !important;
}

[data-theme="dark"] .dropdown-menu {
    background-color: var(--bg-surface);
    border-color: var(--border-color);
}

[data-theme="dark"] .dropdown-item {
    color: var(--text-primary);
}

[data-theme="dark"] .dropdown-item:hover {
    background-color: rgba(var(--secondary-color-rgb), 0.15);
    color: var(--secondary-color);
}

[data-theme="dark"] .dropdown-divider {
    border-color: var(--border-color);
}

/* 11. E-Service Section Styles */
.eservice-card-link {
    display: block;
}

.eservice-card {
    transition: transform var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow var(--transition-speed) ease,
                border-color var(--transition-speed) ease;
}

.eservice-card:hover {
    transform: translateY(-8px);
    border-color: rgba(var(--primary-color-rgb), 0.4) !important;
    box-shadow: 0 15px 35px rgba(var(--primary-color-rgb), 0.12) !important;
}

.eservice-icon-wrapper {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-speed) ease;
}

.eservice-card:hover .eservice-icon-wrapper {
    transform: scale(1.1) rotate(5deg);
}

.eservice-arrow {
    transition: transform var(--transition-speed) ease;
}

.eservice-card:hover .eservice-arrow {
    transform: translateX(5px);
}

.eservice-card-glow {
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(var(--primary-color-rgb), 0.08) 0%, rgba(255, 255, 255, 0) 70%);
    top: -50px;
    right: -50px;
    border-radius: 50%;
    z-index: 1;
    pointer-events: none;
    transition: all var(--transition-speed) ease;
}

.eservice-card:hover .eservice-card-glow {
    background: radial-gradient(circle, rgba(var(--primary-color-rgb), 0.15) 0%, rgba(255, 255, 255, 0) 70%);
    transform: scale(1.2);
}

[data-theme="dark"] .eservice-card-glow {
    background: radial-gradient(circle, rgba(var(--secondary-color-rgb), 0.12) 0%, rgba(0, 0, 0, 0) 70%);
}

[data-theme="dark"] .eservice-card:hover .eservice-card-glow {
    background: radial-gradient(circle, rgba(var(--secondary-color-rgb), 0.2) 0%, rgba(0, 0, 0, 0) 70%);
}

.modal-eservice-card {
    transition: all 0.2s ease-in-out;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: var(--bg-surface);
}

.modal-eservice-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-soft);
    border-color: rgba(var(--primary-color-rgb), 0.3);
    background: rgba(var(--primary-color-rgb), 0.02);
}

[data-theme="dark"] .modal-eservice-card:hover {
    border-color: rgba(var(--secondary-color-rgb), 0.4);
    background: rgba(var(--secondary-color-rgb), 0.05);
}

/* 12. Section Backgrounds & Alternating Gray Shades */
.bg-surface {
    background-color: var(--bg-surface);
}
.bg-base {
    background-color: var(--bg-base);
}
.bg-gray-custom {
    background-color: #f1f3f5;
}

[data-theme="dark"] .bg-gray-custom {
    background-color: #0b0f19;
}

/* 13. E-Book 3D Bookshelf & Cover Styling */
.bookshelf-container {
    background: linear-gradient(to bottom, rgba(var(--bg-surface-rgb), 0.5) 0%, rgba(var(--bg-surface-rgb), 0.9) 100%);
    border: 1px solid var(--border-color);
    position: relative;
}

.bookshelf-wood-line {
    height: 18px;
    background: linear-gradient(90deg, #5c3a21 0%, #8b5a2b 30%, #a0522d 50%, #8b5a2b 70%, #5c3a21 100%);
    border-radius: 4px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3), inset 0 2px 2px rgba(255, 255, 255, 0.2);
    position: relative;
    z-index: 2;
}

.bookshelf-wood-line::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    height: 10px;
    background: rgba(0, 0, 0, 0.15);
    filter: blur(4px);
}

.ebook-card {
    max-width: 200px;
    position: relative;
    margin-bottom: 2rem;
}

/* 3D Book Layout */
.book-3d {
    width: 140px;
    height: 200px;
    position: relative;
    perspective: 1000px;
    transform-style: preserve-3d;
    transition: transform 0.5s ease-in-out;
    margin: 0 auto;
    cursor: pointer;
}

/* Bigger Book Cover in Modal */
.book-3d-lg {
    width: 180px;
    height: 260px;
    cursor: default;
    pointer-events: none;
}

.book-cover {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: left center;
    transform-style: preserve-3d;
    transition: transform 0.5s ease-in-out;
    z-index: 5;
    border-radius: 4px 8px 8px 4px;
    box-shadow: 5px 5px 15px rgba(0, 0, 0, 0.2);
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px 8px 8px 4px;
}

/* Spine overlay to make it look like a book binding */
.book-spine {
    position: absolute;
    top: 0;
    left: 0;
    width: 12px;
    height: 100%;
    background: linear-gradient(90deg, 
        rgba(0, 0, 0, 0.35) 0%, 
        rgba(255, 255, 255, 0.15) 25%, 
        rgba(0, 0, 0, 0.05) 50%, 
        rgba(255, 255, 255, 0.1) 75%, 
        rgba(0, 0, 0, 0) 100%);
    border-radius: 4px 0 0 4px;
}

/* Book pages underneath the cover */
.book-pages {
    position: absolute;
    top: 3px;
    left: 8px;
    width: calc(100% - 10px);
    height: calc(100% - 6px);
    background: #fcfbf9;
    border: 1px solid #e2e8f0;
    border-left: none;
    border-radius: 0 4px 4px 0;
    box-shadow: 2px 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 1;
    transition: transform 0.5s ease-in-out;
}

/* Book pages texture */
.book-pages::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent 0%, 
        #f5f5f5 10%, 
        transparent 20%, 
        #f5f5f5 30%, 
        transparent 40%, 
        #f5f5f5 50%, 
        transparent 60%, 
        #f5f5f5 70%, 
        transparent 80%, 
        #f5f5f5 90%, 
        transparent 100%);
    opacity: 0.15;
}

/* Hover effects for 3D rotation */
.book-3d:hover {
    transform: rotateY(-10deg) rotateX(5deg) translateZ(10px);
}

.book-3d:hover .book-cover {
    transform: rotateY(-30deg);
    box-shadow: 10px 10px 25px rgba(0, 0, 0, 0.35);
}

.book-3d:hover .book-pages {
    transform: rotateY(-10deg) scaleX(0.98);
}

/* Helper for text clamping in Thai */
.text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Dark mode compatibility */
[data-theme="dark"] .bookshelf-container {
    background: linear-gradient(to bottom, rgba(30, 41, 59, 0.5) 0%, rgba(15, 23, 42, 0.8) 100%);
}
[data-theme="dark"] .book-pages {
    background: #f1f5f9;
    border-color: #475569;
}